The necessary sample size can only be determined for estimation problems regarding proportions because we do not know the value of the population standard deviation needed to calculate the necessary sample size for problems dealing with a population mean(s).

Question

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The necessary sample size can be determined for both estimation problems regarding proportions and problems dealing with a population mean(s). For population means, sample size calculations often use an estimated standard deviation or a standard deviation from a similar study if the population standard deviation is unknown.

The Necessary Sample Size Can Only Be Determined for Estimation